During a presentation in the US last month, TIGHAR’s Ric Gillespie backed up all of the group’s theories.

Earhart’s plane was last seen on radar on July 2, 1937.

New findings claim that Earhart made over 100 radio transmissions for help from July 2 (when her plane was last seen on radar) to July 6, 1937.Getty Images

After becoming the first woman to fly solo across the Atlantic Ocean, she embarked on a mission to fly over 29,000 miles around the world.

But on July 2, 1937, four months after beginning her trip, she found herself in trouble.

She was flying at 375 meters (1,230 feet) looking for Howland Island, southwest of Honolulu, but was low on fuel.

It is believed she was not as close to the island as expected, so she safely landed on another island, believed to be Nikumaroro, also known as Gardner Island, which is surrounded by a reef and about 400 miles southeast of Howland Island.

Gillespie said that from the time the plane vanished off radar on July 2 to July 6, there were more than 100 radio transmissions from Earhart calling for help.

A woman in Melbourne even picked up her frequency.

“People started hearing radio distress calls from the airplane and they were verified,” Gillespie said.

Earhart with navigator Fred Noonan. Next July marks the 80th anniversary of their disappearance.AP

About six hours after she went missing, a very weak and unreadable voice was picked up by credible radio operators. They recognized her voice.

A housewife in Texas listening on a short-wave radio a short time later also heard Earhart’s pleas. She heard the plane had landed part in water and part on land.

Gillespie said Earhart told radio operators she was injured, but not as badly as her navigator, Fred Noonan.

“She’s out there calling for help,” Gillespie said.

He believes Earhart landed safely with some fuel left in the tank, because she wouldn’t have been able to work the radio without the engine running.

TIGHAR reported that a woman in Melbourne and a teenager in Florida picked up Earhart’s radio transmissions at the time.Getty Images

Her local transmitter also would not have worked if she landed in water.

It’s now believed that Earhart landed safely on Nikumaroro Island (also known as Gardner Island) and died as a castaway.Getty Images

What’s fascinating about Gillespie’s theory is a girl from St. Petersburg, Florida, who was 16 when Earhart went missing.

According to Gillespie, she was at home listening to her radio when Earhart interrupted the frequency.

The girl grabbed a notebook next to her radio and began to transcribe Earhart’s call for help.

Gillespie now has the notebook and he said the whole thing read like a modern 911 call.

“It’s very confusing, some things don’t seem to make sense,” he said.

“In several places in the notebook she wrote ‘New York, New York.’

“That’s how she wrote New York City or something that sounded like New York City.”

Gillespie said there is a shipwreck at the location where they believe Earhart landed, a ship that was called SS Norwich City, which was abandoned at the island in 1929.

So with all this seeming to add up, why hasn’t anybody found it yet?

Gillespie said TIGHAR had taken a number of trips to the destination but hasn’t had the right equipment to find debris from Earhart’s plane.

It is believed the tide washed it out to sea.

Next July will mark the 80th anniversary since Earhart went missing, and TIGHAR plans to go on another expedition to Gardner Island, but this time, use submarines.

Gillespie said it would be the best tool to find any debris underwater.